U.S. patent application number 13/736771 was filed with the patent office on 2013-07-25 for personal sound amplifier.
This patent application is currently assigned to VOXX INTERNATIONAL CORPORATION. The applicant listed for this patent is VOXX International Corporation. Invention is credited to Prapan Paul Tinaphong.
Application Number | 20130188812 13/736771 |
Document ID | / |
Family ID | 48781841 |
Filed Date | 2013-07-25 |
United States Patent
Application |
20130188812 |
Kind Code |
A1 |
Tinaphong; Prapan Paul |
July 25, 2013 |
PERSONAL SOUND AMPLIFIER
Abstract
A personal sound amplifier device in the form of a hearing aid
worn by a user not only amplifies sounds but also communicates
wirelessly with an external electronic device, such as a cellular
telephone. The personal sound amplifier device includes a first
microphone, an amplification circuit electrically connected to the
first microphone, and a speaker electrically connected to the
amplification circuit for amplifying ambient sound detected by the
first microphone. A second microphone is situated away from the
first microphone. A radio frequency (RF) transmitter and receiver
circuit is electrically connected to the second microphone and to
the speaker. An antenna is connected to the RF transmitter and
receiver circuit. The user's voice is detected by the second
microphone and transmitted by the RF transmitter and receiver
circuit, through the antenna, to an external electronic device.
Signals from the external electronic device are received by the
antenna and processed by the RF transmitter and receiver circuit,
and are emitted as sound through the speaker for the user to
hear.
Inventors: |
Tinaphong; Prapan Paul;
(Carmel, IN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
VOXX International Corporation; |
Hauppauge |
NY |
US |
|
|
Assignee: |
VOXX INTERNATIONAL
CORPORATION
Hauppauge
NY
|
Family ID: |
48781841 |
Appl. No.: |
13/736771 |
Filed: |
January 8, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61584402 |
Jan 9, 2012 |
|
|
|
Current U.S.
Class: |
381/315 |
Current CPC
Class: |
H04R 25/554
20130101 |
Class at
Publication: |
381/315 |
International
Class: |
H04R 25/00 20060101
H04R025/00 |
Claims
1. A personal sound amplifier device for amplifying sound and for
communicating wirelessly with an external electronic device, which
comprises: a housing, the housing defining an internal cavity and
having a first side wall and a second side wall situated opposite
the first side wall; a first microphone mounted on the housing and
situated on the first side wall thereof, the first microphone
detecting ambient sounds and generating an output signal in
response thereto; an amplification circuit situated in the internal
cavity of the housing, the amplification circuit being responsive
to the output signal of the first microphone and generating an
amplified output signal in response thereto; a speaker, the speaker
being responsive to the amplified output signal of the
amplification circuit and generating an audible sound in response
thereto; a second microphone, the second microphone being mounted
on the housing, the second microphone detecting voice sounds
emitted by a user of the personal sound amplifier device and
generating an output signal in response thereto; a radio frequency
(RF) transmitter and receiver circuit, the RF transmitter and
receiver circuit being situated in the internal cavity of the
housing, the RF transmitter and receiver circuit being responsive
to the output signal of the second microphone and generating a
transmit signal in response thereto; and an antenna, the antenna
being electrically coupled to the RF transmitter and receiver
circuit, the antenna transmitting an RF signal to an external
electronic device in response to the transmit signal of the RF
transmitter and receiver circuit, the antenna receiving an RF
signal transmitted by the external electronic device and generating
a received signal in response thereto, the RF transmitter and
receiver circuit generating a speaker signal in response to the
received signal of the antenna, the speaker being responsive to the
speaker signal of the RF transmitter and receiver circuit and
generating an audible sound in response thereto.
2. A personal sound amplifier device as defined by claim 1, wherein
the second microphone is situated on the second side wall of the
housing opposite the first side wall to reduce feedback
interference between the RF transmitter and receiver circuit and
the amplification circuit.
3. A personal sound amplifier device as defined by claim 1, which
further comprises: a mode selection switch, the mode selection
switch being mounted on the housing and being accessible by a user
of the personal sound amplifier device, the mode selection switch
being changeable between at least a first state and a second state
to allow the user to selectively control the operation of the
personal sound amplifier device, wherein, when the mode selection
switch is in the first state, the amplification circuit is disabled
and the RF transmitter and receiver circuit is enabled, and
wherein, when the mode selection switch is in the second state, the
amplification circuit is enabled and the RF transmitter and
receiver circuit is enabled.
4. A personal sound amplifier device as defined by claim 1, wherein
the personal sound amplifier device is in the form of a hearing
aid, and the housing thereof has a generally arcuate shape in order
to rest on the ear of a user of the personal sound amplifier
device.
5. A personal sound amplifier device as defined by claim 4, which
further comprises: a speaker outlet adapter, the speaker outlet
adapter being situated on the housing in proximity to the speaker;
and a hearing tube, the hearing tube being coupleable to the
speaker outlet adapter.
6. A personal sound amplifier device as defined by claim 1, wherein
the amplification circuit includes an integrated circuit having a
digital signal processor, a first microphone input and an audio
amplifier.
7. A personal sound amplifier device as defined by claim 1, which
further comprises: an audio level adjustor, the audio level
adjustor being mounted on the housing and being electrically
coupled to the amplification circuit, the audio level adjustor
selectively adjusting at least one of the gain of the amplification
circuit and the frequency pass band of the amplification
circuit.
8. A personal sound amplifier device as defined by claim 1, wherein
the antenna is in the form of a microstrip antenna.
9. A personal sound amplifier device as defined by claim 1, which
further comprises: an indicator, the indicator being mounted on the
housing so as to be viewable by a user of the personal sound
amplifier device, the indicator being electrically coupled to the
RF transmitter and receiver circuit, the indicator indicating to
the user at least one of whether the RF transmitter and receiver
circuit is disabled and whether the RF transmitter and receiver
circuit is enabled.
10. A personal sound amplifier device as defined by claim 1, which
further comprises: an RF transmitter and receiver circuit activator
switch, the RF transmitter and receiver circuit activator switch
being electrically coupled to the RF transmitter and receiver
circuit, the RF transmitter and receiver circuit activator switch
being mounted on the housing so as to be accessible to a user of
the personal sound amplifier device, the RF transmitter and
receiver circuit activator switch being selectively changeable by
the user to at least a first state, wherein the RF transmitter and
receiver circuit activator switch disables the RF transmitter and
receiver circuit, and a second state, wherein the RF transmitter
and receiver circuit activator switch enables the RF transmitter
and receiver circuit.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is related to U.S. Provisional Application
Ser. No. 61/584,402, filed on Jan. 9, 2012, and entitled "Personal
Sound Amplifier", the disclosure of which is incorporated herein by
reference and on which priority is hereby claimed.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to personal sound
amplification devices for use by hearing impaired persons, and more
particularly relates to personal sound amplification devices having
Bluetooth.TM. functionality.
[0004] 2. Description of the Prior Art
[0005] Conventional personal sound amplifiers ("PSAs"), including
hearing aids, do not have integrated Bluetooth.TM. radios. The
integration of Bluetooth.TM. radios into PSAs has been problematic
due to battery power consumption, output sound interference, and
the space required to incorporate a Bluetooth.TM. circuit within a
hearing aid housing also having the PSA circuit. To utilize
Bluetooth.TM. technology, conventional PSA designs resort to
utilizing a pendant unit worn by the user as a frequency convertor
between the PSA device and Bluetooth.TM. quipped electronic
devices, such as smart phones, the Apple iPad.TM./iPhone.TM.
devices, and Blackberry.TM. devices. The pendant unit converts the
2.4 GHz Bluetooth.TM. frequency into lower frequencies to avoid
interference with the integrated circuitry within the PSA (hearing
aid), and consumes less battery power. This pendant unit provides
the additional internal space needed for housing a relatively large
battery to power the frequency convertor circuitry, and a
relatively large antenna. However, to utilize the Bluetooth.TM.
capabilities, consumers must inconveniently wear the pendant unit
along with the PSA. Conventional pendant units have significantly
limited transmission ranges and signal loss problems. Accordingly,
the user must wear this separate pendant unit having a larger
battery and a larger antenna.
OBJECTS AND SUMMARY OF THE INVENTION
[0006] It is an object of the present invention to provide a
personal sound amplifier having an integrated Bluetooth.TM.
circuit.
[0007] It is another object of the present invention to provide a
personal sound amplifier in the form of a hearing aid which
includes a hearing aid amplification circuit and a short range
radio frequency (RF) transmitter and receiver circuit to allow
wireless communications between the hearing aid and an external
electronic device, such as a cellular telephone.
[0008] It is still another object of the present invention to
provide a personal sound amplifier device, in the form of a hearing
aid, which includes an amplifier circuit for amplifying ambient
noise, and a wireless communication circuit for wirelessly
communicating with an external electronic device, such as a
cellular telephone, and which allows the user of the personal sound
amplifier device to selectively permit operation of just the
amplifier circuit, or allow operation of both the amplifier circuit
and the wireless communication circuit.
[0009] It a further object of the present invention to provide a
personal sound amplifier which is small in size and convenient to
use and which includes the capability of wirelessly communicating
with a remote, external electronic device.
[0010] It is yet a further object of the present invention to
provide a hearing aid having Bluetooth.TM. functionality and which
requires no separate pendant unit to effect wireless communication
with an external, remote electronic device, such as a cellular
telephone.
[0011] It is another object of the present invention to provide a
personal sound amplifier which overcomes the inherent disadvantages
of conventional personal sound amplifiers.
[0012] The present invention provides a novel PSA that includes an
embedded low power Bluetooth.TM. radio that overcomes the
disadvantages found in conventional PSA designs. In accordance with
one form of the present invention, a personal sound amplifier is
preferably formed in the shape of, and functions as, a hearing aid
worn by a user on or in his ear. The personal sound amplifier
includes an ambient sound amplification circuit, a first microphone
electrically connected to the ambient sound amplification circuit,
and a speaker or transducer. The first microphone detects ambient
sounds, and provides an output signal corresponding to the ambient
sounds detected by the first microphone to the ambient sound
amplification circuit. The ambient sound amplification circuit
effectively amplifies the sounds detected by the first microphone,
and provides an output signal corresponding to the amplified
ambient sounds to the speaker or transducer, which amplified sounds
may be heard by the user of the personal sound amplifier.
[0013] The personal sound amplifier also includes a short range,
radio frequency (RF) transmitter and receiver circuit, such as a
Bluetooth.TM. circuit, to allow wireless communications between the
personal sound amplifier and an external electronic device, such as
a cellular telephone. The RF transmitter and receiver circuit is
electrically connected to a second microphone and to the speaker or
transducer of the sound amplification circuit. The second
microphone detects sounds when the user speaks, and provides an
output signal corresponding thereto to the RF transmitter and
receiver circuit. The RF transmitter and receiver circuit transmits
a corresponding signal wirelessly to an external electronic device
situated remotely from the personal sound amplifier. An antenna
connected to the output of the RF transmitter and receiver circuit
is used to transmit signals from the personal sound amplifier to
the external electronic device, and to receive signals transmitted
by the external electronic device to the personal sound
amplifier.
[0014] More specifically, the signals which are transmitted by the
external electronic device are received by the antenna of the
personal sound amplifier. The antenna provides such received
signals to the RF transmitter and receiver circuit, which converts
such signals to audible frequency signals and amplifies the audible
frequency signals (or uses the amplification circuit for amplifying
these signals), and provides the amplified audible frequency
signals to the speaker or transducer of the personal sound
amplifier.
[0015] The user of the personal sound amplifier may communicate
wirelessly with an external electronic device, such as a cellular
telephone, situated remotely from the personal sound amplifier, as
well as selectively hearing amplified ambient sounds. The user may
disable the RF transmitter and receiver circuit so that only the
amplification circuit for amplifying ambient sounds is operational,
or the user may enable both the ambient sound amplification circuit
and the RF transmitter and receiver circuit so that he may both
hear ambient sounds, amplified, and wirelessly communicate with an
external electronic device, such as a cellular telephone.
[0016] These and other objects, features and advantages of the
present invention will be apparent from the following detailed
description of illustrative embodiments thereof, which is to be
read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a perspective view of a personal sound amplifier
formed in accordance with the present invention showing a charging
cable connected to the personal sound amplifier, the personal sound
amplifier being in the form of a hearing aid.
[0018] FIG. 2 is a partially exploded, perspective view of the
personal sound amplifier formed in accordance with the present
invention showing the internal circuitry contained within an
internal cavity of the main body thereof.
[0019] FIG. 3 is a schematic diagram of the electronic circuit of
the personal sound amplifier formed in accordance with the present
invention.
[0020] FIG. 4 is a block diagram of the electronic circuit of the
personal sound amplifier formed in accordance with the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] As can be seen in FIG. 1 of the drawings, a personal sound
amplifier 2 constructed in accordance with a preferred embodiment
of the present invention includes a main body or housing 4 formed
in the shape of a hearing aid (i.e., with a generally arcuate
shape) and ergonomically shaped to rest on the ear of a user. The
housing or main body 4 is formed from two matable half sections.
When mated together, the two sections define an internal cavity for
housing the electronic circuit, antenna and battery of the personal
sound amplifier 2. The main body 4 has mounted thereon a pair of
microphones oriented at opposite lateral ends thereof, a mode
selection switch 6, a Bluetooth.TM. circuit activator switch 8, a
micro-USB connector 11 used in conjunction with a battery charging
circuit for charging the internal battery, and a hollow hearing
tube 12 extending from the main body 4. As will be described in
greater detail, the electronic circuit situated in the internal
cavity of the main body 4 includes a Bluetooth.TM. circuit 28 and a
personal sound amplification circuit 30.
[0022] More specifically, and referring to FIG. 2 of the drawings,
it will be seen that the main body 4 comprises a first half section
14 and a second half section 16. When joined, the first half
section 14 and the second half section 16 define an internal cavity
18 in which the circuitry and electronics of the personal sound
amplifier 2 are secured. A first microphone 20 in electrical
communication with the Bluetooth.TM. circuitry 28 extends at least
partially through a first lateral end or side wall 24 of the main
body 4. A second microphone 22 in electrical communication with the
conventional personal sound amplification circuitry 30 extends at
least partially through a second lateral end or side wall 26 of the
main body 4, the second lateral end or side wall 26 being oriented
opposite to the first lateral end or side wall 24. As will be
described in greater detail, the first microphone 20 is utilized by
the Bluetooth.TM. circuitry 28 to receive audible sounds from the
user. The second microphone 22 is utilized by the conventional
personal sound amplification circuitry 30 to receive ambient
audible sounds and amplify them for the user. The microphones 20,
22 are positioned at opposite ends or side walls of the main body 4
to reduce feedback interference between the Bluetooth.TM. circuitry
28 and the conventional amplification circuitry 30.
[0023] Referring again to FIG. 1 of the drawings, it will be seen
that a mode selection switch 6 in electrical communication with the
Bluetooth.TM. circuitry 28 and conventional amplification circuitry
30 extends at least partially through a top portion 32 of the main
body 4. The mode selection switch 6 allows the user to selectively
control the operation of the personal sound amplifier device 2 of
the present invention. When the mode selection switch 6 is in a
first position, also referred to as the "up" position, the personal
sound amplifier device 2 operates in a first mode in which the
Bluetooth.TM. functionality and circuitry 28 are enabled and the
conventional amplification (hearing aid) circuitry 30 is disabled.
When the switch 6 is in a second position, also referred to as the
"down" position, the device operates in a second mode in which both
the Bluetooth.TM. functionality and circuitry 28 and the
conventional amplification (hearing aid) circuitry 30 operate
concurrently.
[0024] A Bluetooth.TM. circuit activator switch 8 in electrical
communication with the Bluetooth.TM. circuitry 28 extends outwardly
from the second half 16 of the main body 4. The activator switch 8
is preferably a momentary push button switch that controls the
power to the Bluetooth.TM. circuitry 28 and the pairing of the
Bluetooth.TM. circuitry 28 with an external Bluetooth.TM. capable
device (not shown), as will be described in greater detail in the
forthcoming paragraphs.
[0025] Referring to FIGS. 1 and 2 of the drawings, it will be seen
that the battery charging circuit 10 includes a micro-USB female
connector 11 which is mounted on the first lateral end 24 of the
main body 4 and is provided to accept a male micro-USB connector 34
as a DC input. As will be described in greater detail, the female
connector 11 is in electrical communication via internal circuitry
with a lithium polymer battery 36 contained within the cavity 18 of
the main body 4 that provides power to the Bluetooth.TM. circuitry
28 and conventional amplification circuitry 30 for the hearing aid
function.
[0026] Referring to FIGS. 2 and 3 of the drawings, it will be seen
that the conventional amplification circuitry's speaker output pins
40 and the Bluetooth.TM. circuitry's speaker output pins 42 are
connected to a miniature internal speaker 38 positioned within the
cavity 18. An outlet adapter 44, preferably being constructed of
brass, is connected to the miniature speaker 38 and extends at
least partially through the second end 26 of the main body 4. The
hearing tube 12 further includes a first axial end 13. The first
end 13 is fitted on the speaker outlet adapter 44. A dome or ear
bud 48 is mounted on the length of the hollow hearing tube 12 and
is placed in the ear canal of the user, and emits therefrom the
sound carried by the hearing tube 12 from the speaker 38. The
opposite end portion 15 of the tube 12 acts as a retention end and
may be shaped to conform to the shape of the user's ear to help
retain the ear bud or dome 48 within the ear canal.
[0027] Again referring to FIG. 2 of the drawings, it is seen that
the personal sound amplifier 2 formed in accordance with a
preferred embodiment of the present invention includes conventional
amplification circuitry 30 and Bluetooth.TM. circuitry 28 within
the internal cavity 18 of the main body 4. Referring to FIGS. 3 and
4 of the drawings, it can be seen that the conventional
amplification circuitry 30 preferably comprises an integrated
circuit 50 manufactured by Intricon Corporation, specifically, the
Intricon Hybrid IC for PSA, Part No. DS.sub.--91969.sub.--009,
which includes integrated digital signal processing, a microphone
input, and an audio amplifier on a flexible printed circuit board.
The Intricon integrated circuit 50 is powered by a 3.3 volt (V)
lithium polymer battery 36, which voltage is reduced from 3.3V to
about 1.5V via a 470 ohm resistor 52 and two series-connected
1N4148 diodes 54. The mode selection switch 6 is connected in
series between the lithium polymer battery 36 and the Intricon
integrated circuit 50 so that, when the first mode (Bluetooth.TM.
function only) is selected, the power to the Intricon integrated
circuit 50 is cutoff and the conventional amplification circuitry
30 (for the hearing aid function) is disabled. When the second mode
(both Bluetooth.TM. and hearing aid functions) is selected, the
Intricon integrated circuit 50 is operational and receives audible
sounds from the environment surrounding the user via the second
microphone 22 connected to the microphone inputs 56 thereof The
received sounds are input to the integrated circuit's internal
amplifier and output to the miniature speaker 38 contained within
the housing cavity 18. The Intricon integrated circuit 50 may
further be connected to an audio level adjustor 58, preferably in
the form of a momentary push button switch, extending at least
partially from the top portion 32 of the main body 4. The audio
level adjustor 58, when activated, selectively adjusts the audio
output decibel and frequency pass band of the integrated circuit 50
based upon three or four pre-programmed levels.
[0028] Again referring to FIGS. 3 and 4 of the drawings, it will be
seen that the Bluetooth.TM. circuitry 28 within the cavity 18 of
the main body 4 preferably includes a Bluetooth.TM. integrated
circuit 60 manufactured by ISSC Technologies that comprises a
Bluetooth 3.0 radio module with mono and/or stereo outputs, having
Part No. IS1632N, mounted on a printed circuit board, and a
microphone input 62. The Bluetooth.TM. integrated circuit 60 is
powered by the lithium polymer battery 36. The Bluetooth.TM.
circuit further includes a microstrip antenna 64 situated on the
printed circuit board and oriented vertically (when the personal
sound amplifier is properly worn by a user) for Bluetooth.TM. 2.4
GHz communication. The orientation and proximity of the microstrip
antenna 64 to the user's body on the printed circuit board and
within the main body 4 of the device 2 allows the user's body to
enhance the microstrip antenna's reception/transmission and further
reduces signal loss between the Bluetooth.TM. devices and the
personal sound amplifier 2 so that the transmitting range can still
meet the normal Bluetooth.TM. Class 2 radio standard of 30 feet.
The first microphone 20 in electrical communication with the
Bluetooth.TM. integrated circuit 60 receives the user's audible
sounds. The audible sounds are then encoded by the integrated
circuit's internal signal processor and are sent wirelessly to an
external Bluetooth.TM.-capable device, such as an iPhone.TM. device
or Blackberry.TM. device, via the microstrip antenna 64. The
microstrip antenna 64 also receives wireless transmissions from the
external device and inputs them to the Bluetooth.TM. integrated
circuit 60. The speaker outputs 66 of the Bluetooth.TM. integrated
circuit 60 are connected to the internal miniature speaker 38.
Transmissions received by the microstrip antenna 64 are processed
by the integrated circuit 60 and then output to the user through
the miniature speaker 38.
[0029] An LED (light emitting diode) Bluetooth.TM. status indicator
68 extending at least partially through the second half 16 of the
main body 4, or at least visually identifiable within the second
half 16 of the main body 4, is connected to the Bluetooth.TM.
integrated circuit 60 and assists with the control of the device's
Bluetooth.TM. functionality. More specifically, a user may
selectively activate the Bluetooth.TM. function via activator
switch 8 extending through the second half 16 of the main body 4 in
response to the LED Bluetooth.TM. status indicator's output. For
example, to establish communication between the external
Bluetooth.TM.-capable device and the personal sound amplifier 2
formed in accordance with the present invention, it is necessary to
"pair" the devices. To pair the devices, it is first necessary to
turn the Bluetooth.TM. function on by pressing the Bluetooth.TM.
activator switch 8 once. Once the Bluetooth.TM. function has been
turned on, the LED Bluetooth.TM. status indicator 68 will flash
every two seconds to indicate that the Bluetooth.TM. functionality
has been activated. To pair the personal sound amplifier 2 and the
external Bluetooth.TM.-capable device for the first time, the
activator switch 8 is depressed for a few seconds and the LED
indicator 68 will flash and then change to a steady illumination
state, indicating that the personal sound amplifier's Bluetooth.TM.
functionality is ready for pairing (i.e., the personal sound
amplifier 2 may be recognized by the external Bluetooth.TM.-capable
device). The external device then searches for the Bluetooth.TM.
signal transmitted by the personal sound amplifier 2, and a numeric
pairing key corresponding to the Bluetooth.TM. integrated circuit,
typically "0000", is entered to pair the devices. After the first
pairing has been completed, the external device will recognize the
personal sound amplifier for subsequent pairings automatically. To
turn off the Bluetooth.TM. functionality, a user may press and hold
the Bluetooth activator switch 8 for a few seconds, and the LED
status indicator 68 will go off, indicating that the Bluetooth.TM.
functionality has been turned off.
[0030] Referring again to FIGS. 3 and 4 of the drawings, it will be
seen that the battery charging circuit 10 preferably includes a
micro-USB female connector 11 (or some other form of adapter) in
which a 5V DC source is input to a power supply or voltage
regulator or converter circuit 70 defining at least a portion of
the battery charging circuit 10. As shown in greater detail in the
schematic illustrated in FIG. 3 of the drawings, the charging
circuit 10 charges a 3.3V lithium polymer battery 36 that is
positioned within the cavity 18 of the main body 4 of the personal
sound amplifier 2 and provides power to both the Bluetooth.TM.
circuitry 28 and the conventional amplifier circuitry 30 for the
hearing aid function.
[0031] In operation, when the user desires to use the personal
sound amplifier's Bluetooth.TM. functionality to communicate with
his external Bluetooth.TM.-capable cellular phone or other device,
the user would place the mode selection switch 6 in the first
position. In this position, the conventional amplifier circuitry 30
is disabled and the Bluetooth.TM. circuitry 28 is enabled. The
user's audible transmissions are received by the first microphone
20 in electrical communication with the Bluetooth.TM. integrated
circuit 60 and wirelessly transmitted to the paired external
cellular phone. Incoming telecommunication transmissions received
by the external cellular phone from a telecommunications network
are then wirelessly transmitted back to the personal sound
amplifier's Bluetooth.TM. integrated circuit 60 and output to the
user from the miniature speaker 38 and hearing tube 12 connected
thereto.
[0032] When the user desires to have both Bluetooth.TM.
functionality and conventional amplifier functionality operating,
for example, while driving a car in which it is necessary both to
hear the ambient sounds of the road and communicate with an
external cellular phone, the user may place the mode selection
switch 6 in the second position. In this position, the lithium
polymer battery 36 provides power to both the Bluetooth.TM.
circuitry 28 and the conventional amplification circuitry 30. As
discussed in the previous paragraph, the first microphone 20 will
receive audible transmissions from the user and transmit them to
the external cellular phone via the personal sound amplifier's
Bluetooth.TM. integrated circuit 60. Simultaneously, the second
microphone 22 in electrical communication with the conventional
amplification circuitry 30 will receive ambient sounds from the
environment, amplify them via the Intricon integrated circuit 50,
and output them to the user through the miniature speaker 38 and
hearing tube 12 connected thereto. As can be seen in the block
diagram illustrated in FIG. 4 of the drawings, both the
Bluetooth.TM. integrated circuit 60 and Intricon integrated circuit
50 output their signals to the same miniature speaker 38. Thus, the
user may hear both amplified ambient sounds and wireless
transmissions from an external device simultaneously from a single
speaker 38. Furthermore, by using two separate microphones 20, 22
which are located on the main body 4 in opposite directions from
each other, this arrangement reduces or avoids feedback
interference from the ambient sounds detected by microphone 22 of
the hearing aid circuit and the user's voice detected by the
microphone 20 of the Bluetooth.TM. circuit. Accordingly, the user
may be able talk on the phone via Bluetooth.TM. transmission and
also be alert to surrounding ambient noise.
[0033] Although illustrative embodiments of the present invention
have been described herein with reference to the accompanying
drawings, it is to be understood that the invention is not limited
to those precise embodiments, and that various other changes and
modifications may be effected therein by one skilled in the art
without departing from the scope or spirit of the invention.
* * * * *